GB746692A - Improvements in or relating to interpolymers - Google Patents

Abstract

An unsaturated partially halogenated interpolymer containing 1 to 5 per cent of iodine and chlorine is made by reacting with iodine monochloride at below 25 DEG C., preferably below 0 DEG C., an interpolymer comprising a major proportion of an iso-olefin containing from 4 to 8 carbon atoms and a terminal methylene group with a minor proportion of at least one polyolefinic hydrocarbon. A third monomer such as styrene, chlorostyrene, acrylyl chloride or methallyl chloride may be present in the interpolymer. Specified iso-olefins are isobutylene, 3-methyl or 2-ethyl butene-1, and 4-methyl- or -ethylpentene-1, while specified polyolefins include butadiene, isoprene, 2,4-dimethyl butadiene, piperylene, 2-methyl-hexadiene-1,5, cyclopentadiene, dipentane, sylvestrene, phellandrene, 2,6-dimethyl-4-methylene-heptadiene-2,5, myrcene, fulvene, 6-ethyl fulvene, 1,3,3-trimethyl-6-vinyl-cyclohexadiene-2,4, 6,6-vinyl-methyl-fulvene, phenyl butadienes, divinyl benzene, diallyl benzene and divinyl naphthalenes, many other similar compounds being specified. The halogenation may be effected by using a solution, dispersion or cement of the interpolymer and iodine parachloride in an organic solvent or diluent such as a hydrocarbon or halogen derivative thereof, e.g. methyl chloride. The product may be compounded with the usual vulcanizing ingredients and cured. It may also be mixed with natural rubber, polychloroprene, polybutadiene, copolymers of chloroprene, butadiene or isoprene with each other or with styrene, acrylonitrile, acrylic and methacrylic acids and their alkyl esters, vinyl pyridine and vinylidene chloride. Adhesive cements may be made from the interpolymer, channel black and heptane.ALSO:Natural rubber is mixed with vulcanizing agents (sulphur, mono and diheptyl diphenylamines, furnace black, zinc oxide, stearic acid, mercaptobenzothiazole, diortho-tolyl quanidine and sulphur are specified) and an isoolefin-polyolefin interpolymer which has been after-treated with iodine monochloride (see Group IV(a)) and cured. 30 parts natural rubber to 70 of interpolymer are used. The after-treated interpolymer may be mixed with channel black and n-heptane and used to bound together sheets of butyl type rubbers and natural rubber.